What can you infer about mary shelleys personality based on this this statement? and as it will be confined to such topics as have connection with my authorship alone, I can scarely accuse myself a personal intrusion

This quote from the introduction of Frankenstein shows that Mary Shelley is a very private person and does not welcome a ton of intrusions into her life. However, she is willing to excuse presenting some of herself and the way she came up with Frankenstein because it's only about her authorship, not about herself personally.